Description: A polyhedron is a three-dimensional shape that has flat surfaces and straight edges. Learn whether or not a certain net could be folded up into a certain rectangular prism. Created by Sal Khan. Teddy knows that a figure has a surface area of 40 square centimeters. The net below has 5 centimeter and 2 centimeter edges. So this is one of the 5 centimeter edges right over here.*Teacher Advisor is 100% free.